What precisely does the inside of a neutron star seem like? A neutron star is what stays after the supernova of a large star. It's a compact, ultra-dense physique made up of neutrons, you guessed it. In reality, this isn’t solely true. Mathematical fashions present that neutron stars include layers and that these layers comprise one thing apart from neutrons. However trying nearer in a neutron star, you see increasingly neutrons tight and fewer and fewer. When you get to the center, it's largely neutrons.